Academic literature on the topic 'Estabilidade de emulsão'
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Journal articles on the topic "Estabilidade de emulsão"
Lange, Marcela Kist, Graziela Heberlé, and Denise Milão. "Avaliação da estabilidade e atividade antioxidante de uma emulsão base não-iônica contendo resveratrol." Brazilian Journal of Pharmaceutical Sciences 45, no. 1 (March 2009): 145–51. http://dx.doi.org/10.1590/s1984-82502009000100018.
Full textCoelho, Marta De Oliveira, Suélen De Oliveira Rezende, Mariana Gavioli dos Reis Pena, and Fabiano Freire Costa. "Estudo da ação emulsificante da polpa de abacate associada às proteínas do soro de leite." Revista do Instituto de Laticínios Cândido Tostes 73, no. 3 (March 12, 2019): 122–35. http://dx.doi.org/10.14295/2238-6416.v73i3.677.
Full textÁlvarez, Luisa Fernanda Arango, Fernanda Gadler, Kamilla Vasconcelos Savasini, and Liedi Legi Bariani Bernucci. "Caracterização de emulsões asfálticas brasileiras a partir do protocolo Emulsion Performance Grade (EPG)." TRANSPORTES 29, no. 1 (April 30, 2021): 247–63. http://dx.doi.org/10.14295/transportes.v29i1.1977.
Full textTerra, Nelcindo Nascimento, Leadir Lucy Martins Fries, Liana Inês Guidolin Milani, Neila Silvia Pereira dos Santos Richards, Ana Paula de Souza Rezer, Ângela Maria Backes, Suen Beulch, and Bibiana Alves dos Santos. "Emprego de soro de leite líquido na elaboração de mortadela." Ciência Rural 39, no. 3 (June 2009): 885–90. http://dx.doi.org/10.1590/s0103-84782009000300038.
Full textMenezes, João Lucas, Marcelo Giordani Minozzo, Dayse Aline Silva Bartolomeu De Oliveira, Monique Lopes Ribeiro, Flávia Regina Spago de Camargo Gonçalves, Rafael Rigoni Cardoso, and Raoní Gonçalves De Souza. "DESENVOLVIMENTO E CARACTERIZAÇÃO FÍSICO-QUÍMICA DE HIDROLISADO PROTEICO DE PEROÁ (Balistes capriscus) PRODUZIDO A PARTIR DE COPRODUTOS." Revista Ifes Ciência 5, no. 1 (November 21, 2019): 208–18. http://dx.doi.org/10.36524/ric.v5i1.280.
Full textMathias, Lígia Andrade da Silva Telles, Luiz Piccinini Filho, José Carlos Rittes, Flávia Salles Souza, José Ricardo Pinotti Pedro, Wagner Cirillo, and Joaquim Edson Vieira. "Isoflurano em emulsão lipídica por via venosa promove estabilidade cardiovascular respiratória em modelo experimental." Revista Brasileira de Anestesiologia 54, no. 5 (October 2004): 650–62. http://dx.doi.org/10.1590/s0034-70942004000500005.
Full textPereira, Luciano José Barreto, and Edwin Elard Garcia-Rojas. "Emulsões múltiplas: formação e aplicação em microencapsulamento de componentes bioativos." Ciência Rural 45, no. 1 (January 2015): 155–62. http://dx.doi.org/10.1590/0103-8478cr20140315.
Full textStarling, Christiane A., Fernanda G. de Souza, and Adriana A. de Carvalho. "Efeito da Extrusão nas Propriedades Bioquímicas e Tecnológicas da Farinha Bandinha de Feijão." Revista Processos Químicos 10, no. 19 (January 4, 2016): 39–49. http://dx.doi.org/10.19142/rpq.v10i19.345.
Full textSantana, Gabriela Silva, Josemar Gonçalves de Oliveira Filho, and Mariana Buranelo Egea. "CARACTERÍSTICAS TECNOLÓGICAS DE FARINHAS VEGETAIS COMERCIAIS." JOURNAL OF NEOTROPICAL AGRICULTURE 4, no. 2 (June 28, 2017): 88–95. http://dx.doi.org/10.32404/rean.v4i2.1549.
Full textBraga, Filipe Augusto Gomes, Adriele Sousa Silva, Amanda Maria Barros Alves, Andressa Yane Soares Alves, Antônia Fádia Valentim de Amorim, Carlos Eduardo Pereira de Freitas, Francisco Valmiller Lima de Oliveira, and Sônia Maria Costa Siqueira. "Obtenção e estudo de estabilidade de biohidrogel de galactomanana aditivado com emulsão de óleo de coco." Brazilian Journal of Development 6, no. 7 (2020): 50969–82. http://dx.doi.org/10.34117/bjdv6n7-660.
Full textDissertations / Theses on the topic "Estabilidade de emulsão"
Daneluti, André Luís Maximo. "Estudo termoanalítico envolvendo estabilidade e pré-formulação de ácido fítico livre/emulsão." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/9/9139/tde-15082013-092040/.
Full textThis study aims the application of thermal analysis for characterization, evaluation of stability and thermal decomposition of phytic acid and components of its pharmaceutical formulation. The pre-formulation studies of pharmaceutical semi-solid (emulsion) used for the treatment of hyperpigmentation and studies for determination of kinetic parameters were developed using thermoanalytical techniques (differential scanning calorimetry, thermogravimetry and derivative thermogravimetry), elemental analysis C, H and N, and infrared absorption spectroscopy and potentiometry. Inicially it was identified samples of phytic acid and kojic acid through the techniques of elemental analysis and infrared absorption spectroscopy and potentiometry (just in case of phytic acid). The intermediate products of thermal decomposition of phytic acid were also evaluated by infrared spectroscopy and elemental analysis. The profile of phytic acid and thermal properties of all components present in the emulsion were cataloged. Due to the thermogravimetric profile presented by phytic acid, with two main stages of mass loss (dehydration and thermal decomposition), it was performed a kinetic study of these steps, using non-isothermal thermogravimetric methods. Starting from curves TG / DTG and DSC acid phytic and physical mixtures of all components of the emulsion (1:1), the interaction was found between the mixtures: phytic acid / EDTA, phytic acid / kojic acid and phytic acid / silicone oil. In infrared spectroscopy found that only physical mixture phytic acid / kojic acid had interaction. By studying the kinetics of volatilization of BHT, it was possible to estimate the time of volatilization of the sample during the preparation of emulsions. In the study of the thermal behavior of the emulsions was concluded that the addition of kojic acid increases the thermal emulsion stability. By comparing the results of the first stage of mass loss DTG curve, it is possible to determine that the emulsion of phytic acid showed a higher thermal stability relative to the others emulsions.
Santoro, Diego Monegatto. "Propriedades físico-químicas de emulsões obtidas a partir dos emulsificantes monoestearato de glicerila e cetil fosfato de potássio." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/9/9139/tde-01102007-084445/.
Full textlntroduction: The physical stability of emulsions can be evaluated through droplets distribution evaluation, rheological properties, thermal analysis, microscopy and others. Objective: Evaluate the physical stability of emulsions containg different concentrations of anionic (A - potassium cetyl phosphate 3, 5 e 7%) and non-ionic emulsifiers (N - glyceril monostearate, 3, 5 e 7%), and the influence ofthe scale-up processo Methodology: Evaluate the droplets distribution with laser diffraction, rheology analysis, microscopy and thermogravimetry (TG). Results and Conc1usion: The values of 90% of the droplets were below 92.66 µm, 50.28µm and 38.80µm, respectively for 3, 5 and 7% ofN emulsifier. For system A, 90% ofthe droplets were below 3.85µm, 4.89µm and 63.57µm, for 3, 5 and 7%. The scale-up process influenced both systems, with an increase in the viscosity on system A from 6.614 Pa.s to 81.55 Pa.s and from 3.366 Pa.s to 7.153 Pa.s for system N. ln the TG analysis, only bulk water could be detected in system N and, in the system A, both interlamellar and bulk water were detected (initial and stability).
Shimada, Robson Takeshi. "Estabilidade de emulsões na presença da biomassa da microalga Arthrospira platensis e do polímero hidroxipropil metilcelulose." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/46/46136/tde-22082017-101321/.
Full textArthrospira platensis or Spirulina is a microalga with a high nutritional value. Extracts of Spirulina were prepared, characterized and applied as oil in water (O/W) (10 % v/v) emulsion stabilizers in the absence and presence of four types of hydroxypropyl methylcellulose (HPMC). The emulsions were prepared with edible sunflower oil. Crude extracts of Spirulina were prepared in buffers at pH 6 (CE6-Crude extract pH6) and pH 8 (CE8-Crude extract pH8) by sonication to promote cell lysis and protein and phospholipids release; part of the extracts was centrifuged (CCE6 or CCE8). Regardless of the extraction conditions, all extracts presented mean -potential ranging from (16 ± 2) mV to (20 ± 2) mV, mean diameter ranging from (108 ± 52) nm to (306 ± 68) nm and interfacial activity. The emulsions prepared with Spirulina extracts (10 g/L) displayed particles with mean -potential ranging from (16 ± 2) mV to (27 ± 4) mV, mean diameter ranging from ~ 70 nm (CCE6 or CCE8) to ~ 700 nm (CE6 or CE8). However, CE6 led to emulsions slightly more stable than the others did. The combination of CE6 (10 g/L) HPMC (1.0 wt %) led to substantial increase in the emulsion stability, although the -potential values decreased one order of magnitude. Particularly, the HPMC with the highest molecular weight and highest methyl substitution degree led to the most (i) robust interfacial layer resulting from the complex formation between HPMC chains and CE6 proteins and (ii) viscous continuous medium.
Filippin, Fabíola Branco. "Estudos de estabilidade de anfotericina B associada à emulsão lipídica rica em triacilgliceróis destinada a administração endovenosa." Florianópolis, SC, 2005. http://repositorio.ufsc.br/handle/123456789/101641.
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A freqüência de infecções fúngicas tem crescido nos últimos anos, sendo que as infecções por leveduras do gênero Candida e os fungos filamentosos do gênero Aspergillus são as mais freqüentes. O antifúngico padrão de largo espectro, anfotericina B (AB) em desoxicolato de sódio (AB-DOC), é considerado fármaco de primeira escolha no tratamento dessa enfermidade. Porém, a sua administração em pacientes gravemente debilitados é seguida geralmente de várias reações adversas. De todas, a nefrotoxicidade é a mais grave, uma vez que a deterioração da função renal limita freqüentemente a dose ou o tratamento, reduzindo a probabilidade de um resultado clínico satisfatório. A necessidade de minimizar os efeitos tóxicos da AB veio estimular uma grande variedade de abordagens experimentais, dentre as quais o desenvolvimento de uma microemulsão lipídica rica em triacilgliceróis, preocupando-se com a manutenção da eficiência terapêutica e estabilidade da formulação. Diante disso, o objetivo do trabalho foi desenvolver uma microemulsão por meio de técnica de ultraemulsificação, estéril e apirogênica, com o intuito de administrá-la endovenosamente. Utilizou-se, portanto, componentes compatíveis com a administração endovenosa, mais especificamente, lipídios, de forma a mimetizar quilomícrons da linfa. O intuito foi de associar a AB a essa partícula de modo a torná-la menos propensa a agregação AB-AB. A caracterização e os estudos de estabilidade foram contemplados de forma a abranger as propriedades físico-químicas da partícula como diâmetro, potencial zeta, grau de agregação avaliado por espectros de absorção na região UV-Visível, taxa de incorporação e estabilidade da associação AB:lipídeo e finalmente a atividade antifúngica do fármaco vetorizado a microemulsão. O desenvolvimento das microemulsões lipídicas contendo AB mostrou-se viável, compatível com administração endovenosa no que contempla valores de pH e diâmetro da partícula, bem como da estabilidade e apirogenicidade. A associação entre AB e os componentes lipídicos mostrou-se estável, mesmo em condições drásticas de armazenamento (25 °C). A atividade antifúngica foi mantida ao longo de 4 meses, bem como o conteúdo de AB às partículas. Desta maneira, a microemulsão lipídica mostrou-se viável e promissora como veículo alternativo de AB, principalmente pela estabilidade e manutenção da atividade antifúngica.
Rosani, Leandro. "Desenvolvimento e estudo da estabilidade de nanoemulsões do tipo óleo em água com óleos vegetais." Universidade Federal de São Carlos, 2011. https://repositorio.ufscar.br/handle/ufscar/6562.
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A low energy emulsification method was used to prepare o/w emulsions of sweet almond or Brazil nut oils stabilized by Tween 80 and Span 80. Stable nano emulsions with droplet size of 160 nm and 270 nm were obtained for almond and Brazil nut oils, respectively, under critical hydrophilic lipophilic balance (HLB). A correlation between emulsions viscosity and particle size allows a precise HLB determination for the oils. The main destabilization mechanism for the emulsions prepared with sweet almond oil was found to be Ostwald ripening that change to coalescence for the emulsion with oil content higher than 10% w/w and HLB higher than 10.
O método de emulsificação a baixa energia foi utilizado para preparar emulsões do tipo o/a contendo óleo de amêndoas ou de castanhas estabilizadas com Tween 80 e Span 80. Foram obtidas nanoemulsões estáveis com tamanho médio de gotículas de 160 nm e 270 nm para os sistemas preparados com óleo de amêndoas e castanha, respectivamente, em condições específicas de equilíbrio hidrófilo lipófilo (EHL). A correlação entre as medidas de viscosidade e de tamanho de partículas permite uma determinação mais precisa do EHL dos óleos. O principal mecanismo de desestabilização observado para a emulsão preparada com óleo de amêndoas foi o Ostwald ripening, que mudou para coalescência para as emulsões com conteúdo de óleo maior que 10% m/m e EHL maior que 10.
Cordeiro, Lara Bissonho de Almeida. "Desenvolvimento farmacotécinico e estudo de estabilidade de emulsões à base de óleo de semente de maracujá para prevenção de feridas." Niterói, 2017. https://appdesenv.uff.br/riuff/handle/1/3304.
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Óleos vegetais são ricos em ácidos graxos essenciais, sendo estes ácidos necessários para manter a integridade da pele e a barreira de água, prevenindo assim a formação de feridas. Ferida pode ser definida como toda alteração da integridade anatômica da pele, resultante de qualquer tipo de trauma. O tratamento de feridas envolve aspectos sistêmicos e locais. O ácido oléico é o ácido graxo mais freqüentemente encontrado na composição dos óleos fixos, sendo acompanhado pelos ácidos linoléico e linolênico. Os objetivos deste trabalho foram desenvolver e avaliar a estabilidade física de emulsões O/A contendo óleo de semente de maracujá. Emulsões O/A contendo 10,0% (p/p) de óleo de semente de maracujá foram preparadas utilizando as ceras Lanette®, Polawax®, e monoestearato de glicerila e o emulsionante polimérico Pemulen® como base das formulações, variando-se as concentrações dos adjuvantes farmacotécnicos: miristato de isopropila, propilenoglicol e glicerina. O tipo de emulsão foi verificado pelo método das medidas de condutividade elétrica e o aspecto, homogeneidade e características organolépticas avaliadas através de análises macroscópicas. Para avaliar a estabilidade acelerada, as amostras foram submetidas a diferentes condições de estresse e analisadas a partir do valor de pH, análises macroscópicas, centrifugação, espalhabilidade, viscosidade aparente e comportamento reológico. As mulsões preparadas com óleo de maracujá, 0,3% (p/p) Pemulen®, apresentaram-se estáveis com propriedades pseudoplásticas e tixotrópicas. As características macroscópicas e valores obtidos de pH, viscosidade aparente e espalhabilidade durante a estocagem indicaram estabilidade da formulação
Vegetable oils are rich in essential fatty acids, these acids being necessary to maintain the integrity of the skin barrier and the water, thus preventing the formation of wounds. Wound can be defined as any change in the anatomical integrity of the skin, resulting from any kind of trauma. Treatment of wounds involves local and systemic aspects. Oleic acid is the fatty acid most frequently found in the composition of fixed oils, accompanied by linoleic and linolenic acids. Our objectives were to develop and evaluate the physical stability of O/W emulsions containing passion fruit seed oil. Emulsions containing 10.0% (w / w) of passion fruit seed oil were prepared using waxes Lanette ®, Polawax ®, glyceryl monostearate and the polymeric emulsifier Pemulen ® based formulations, varying concentrations of pharmaceutical adjuvants: isopropyl myristate, propylene glycol and glycerin. The emulsion type was verified by the method of the electrical conductivity measurements and the appearance, consistency and organoleptic properties were evaluated by macroscopic analysis. To evaluate the accelerated stability, samples were subjected to different stress conditions and the pH value, macroscopic analysis, centrifugation, viscosity, spreadability and rheological behavior were evaluated. The emulsions prepared with passionflower oil, 0.3% (w/w) Pemulen® were stable and presented thixotropic and pseudoplastic properties. The macroscopic characteristics and values of pH, viscosity and spreadability during storage showed stability of the formulation
Borrin, Thaís Ribeiro. "Nanoemulsões produzidas pelo método do ponto de inversão da emulsão (EIP) para encapsulação de curcumina: parâmetros de produção, estabilidade físico-química e incorporação em sorvete." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/74/74133/tde-17092015-102029/.
Full textCurcumin has several beneficial properties and the food industry has been trying to increase the use of curcumin as flavoring, conservant or as a replacer of artificial yellow dyes. However, incorporating curcumin can be difficult due to its hydrophobicity and low water solubility, as well as high sensitivity to light. Encapsulation in nanoemulsions can be an interesting technological alternative to encapsulate and protect the curcuminoid. The objective of this study was to produce nanoemulsions encapsulating curcumin by the low-energy method EIP (emulsion inversion point), determining operating parameters that enable a future escalation of the process and incorporation of dispersions in pineapple ice cream. The production parameters were adjusted as: type and concentration of surfactante, soybean oil concentration, type and concentration of cosolvent, impeller type/speed stirring and flow of the aqueous phase. The percentages of encapsulated curcumin were 0.03, 0.07 and 0.10%. The concentration of 0.07% was the most viable for application in pineapple ice cream, for presenting better distribution of droplet size (hydrodynamic diameter), do not presente of significant changes in lipid oxidation, good maintenance of encapsulated curcumin (70%) and therefore its color, with greater stability of the TCD parameter for a period of 60 days. The rheological tests showed no change in the nanoemulsions structure with encapsulating curcumin. Among the formulations tested for pineapple ice cream incorporating encapsulated curcumin, the formulation using nanoemulsions replacing 50% of the commercial mixture (B) had a better acceptance of color, flavor and aroma and it is compatible with the commercial formulation (A). This formulation (B) and that with complete replacement of the commercial mixture (C) had a higher stability and maintenance of color during the storage period. The rheological tests showed no structural difference between the formulations tested for pineapple ice cream, indicating no influence on the structural characteristics of the ice cream containing nanoemulsion with encapsulated curcumin.
Ramos, Wagner Soares. "Estudo de segurança e eficácia in vitro do ácido p-Cumárico e sua incorporação em emulsão cosmética óleo em água (O/A) /." Araraquara, 2019. http://hdl.handle.net/11449/181706.
Full textResumo: O ácido p-cumárico (APC) é um composto fenólico não flavonóide que apresenta segurança e eficácia bem descritas na ciência dos alimentos devido suas propriedades antioxidante, antitumoral, anti-inflamatória, antimicrobiana e por apresentar baixa toxicidade oral. Essas propriedades são pouco exploradas em produtos para cuidados com a pele. O objetivo do presente estudo foi avaliar de forma in vitro a segurança e a eficácia do APC e incorporá-lo em emulsão cosmética óleo em água (O/A). Nossos estudos in vitro e alternativos ao uso de animais foram conduzidos para verificar a citotoxicidade do APC em células de queratinócitos (HaCat) e fibroblastos humanos (HDFa), o potencial de irritação ocular (HET-CAM) e a atividade antimicrobiana em diferentes cepas. Emulsões contendo APC foram submetidas ao estudo de estabilidade e de liberação, retenção e permeação cutâneas. Resultados: o IC50 do APC em células HaCat e HDFa foi 693,57 e 2.814,75 μg/mL, respectivamente. Além disso 100 μg de APC foram levemente tóxicos em membrana corioalantóica de ovo embrionado. As concentrações bactericidas mínimas em cepas de E. coli, S. aureus, P. aeruginosa e S. epidermidis, foram 3.000 μg/mL, 1.875 μg/mL, 3.750 μg/mL e 3.750 μg/mL, respectivamente. Emulsões contendo diferentes concentrações de APC foram estáveis durante o período de estabilidade acelerada. Após 12 horas 91,08 ± 0,03% do APC foi liberado da formulação e após 24 horas, 0,52 ± 0,18% e 0,94 ± 0,37% ficaram retidos no estrato córneo e na e... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: p-Coumaric acid (PCA) is a non flavonoid phenolic compound whose safety and efficacy widely described in food science papers due to antioxidant, antitumor, anti inflammatory properties, and low oral toxicity. These characteristics are poorly or no described when PCA is added to skin care products. The aim of the present study was to evaluate the safety and efficacy of PCA through in vitro assays, and then add it in oil in water cosmetic emulsion (O/W). Our in vitro trials, without animal use were conducted to predict PCA´s cytotoxicity in HaCat and HDFa cells, ophthalmic irritation potential, and antibacterial activity against differents strains. Emulsions with PCA has been tested to predict shelf life, dermal absorption, and dermal retention. Results: PCA´s IC50 in HaCat and HDFa cells was 693.57 and 2,814.75 μg.mL-1, respectively. In addition 100 μg of APC were slightly toxic in chorioallantoic membrane assay. The minimum bactericidal concentrations against E. coli, S. aureus, P. aeruginosa and S. epidermidis strains were 3,000 μg.mL-1, 1,875 μg.mL-1, 3,750 μg.mL-1, and 3,750 μg.mL-1 , respectively. Emulsions containing 0.04%, 0.06%, 0.08% and 0.10% of PCA were stable during self life testing for ninety days. After 12 hours 91.08 ± 0.03% of PCA was released of the emultion, and after 24 hours 0.52 ± 0.18% and 0.94 ± 0.37%, were present in stratum corneum and epidermis/dermis, respectively. Our findings indicate that PCA concentrations would be effective and safe to use in c... (Complete abstract click electronic access below)
Mestre
Carli, Cynthia de. "Nanoemulsões encapsulando quercetina produzidas pelo método do ponto de inversão da emulsão (EIP): estabilidade físico-química e avaliação da atividade antioxidante in vitro e em produto cárneo." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/74/74132/tde-14062017-113435/.
Full textQuercetin is a flavonoid with recognized high antioxidant activity Due to this fact, the food industry has been trying to use it as an alternative as a preservative in food matrices. However, incorporating quercetin into food formulations may be challenging due to its relative degree of hydrophobicity. Encapsulation methods in nanoemulsions may render the protection of the flavonoid viable, as well as enable its dispersibility in aqueous media. The objective of the present study was to produce nanoemulsions (oil phase: sunflower oil) encapsulating quercetin by the emulsion inversion point method (EIP), determining operating parameters that enable a future process scale-up. A case study on the incorporation of nanodispersions into chicken patê was also carried out. The production parameters evaluated were: type and concentration of surfactant (SOR ratio, surfactant:oil ratio), soybean oil concentration, cosolvent concentration and stirring speed. Nanoemulsions were produced using two different surfactants, Tween 80 and Brij 30. The percentages of encapsulated quercetin were 0.15 and 0.30% (m / m). Among these, the concentration of 0.30% was the most feasible for application in chicken pâté, since it presented better droplet size distribution (hydrodynamic diameter), did not present significant variation of lipid oxidation and higher capacity of preserving encapsulated quercetina for a period of 90 days. The interfacial tension values obtained show that quercetin lowered the interfacial tension of the system, which may indicate that quercetin forms a complex with the surfactants used, a fact that decisively influences its location in the nanodroplets. Among the formulations tested in chicken pâté containing quercetin, only the formulation using free quercetin did not show good acceptance evaluation on the color and taste itens. Such an evaluation was important as it justifies the need for the incorporation of quercetin into nanoemulsions in order to not cause significant sensorial changes in the product.
Maciel, Náira Rezende. "Desenvolvimento de emulsões múltiplas cosméticas contendo óleo de girassol e óleo de gergelim: estudos de estabilidade físico-química." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/60/60137/tde-10012013-164053/.
Full textCurrently, it has been given great importance to the creation of new delivery systems for active ingredients. In the cosmetic area, the highlighted systems are nanoemulsions, multiple emulsions and liquid crystal/lamellar gel phase emulsions. In multiple emulsions coexist O/W and W/O types of emulsions. They have several advantages over other delivery systems, such as the possibility of carry out two incompatible active ingredients in different compartments and the control of the release of the same. Moreover, they have biocompatibility, biodegradability and different oils and surfactants can be used. Another recent trend in cosmetology is the use of vegetable raw materials associated with the delivery systems for active ingredients, to formulate new products with commercial and sustainable appeal. The objective of this study was to develop a new system of multiple emulsion, in one step emulsification, which have stability and distinctive features. It was selected two vegetable oils: sunflower and sesame, which were used separately in the development of the multiple emulsions. The method of emulsification used was emulsion phase inversion (EPI). The critical HLB of oils was, 6.5 for sunflower oil and 5.0 for sesame oil, respectively. The pairs of surfactants chosen for the study were Steareth 2 - Steareth 20 for sunflower oil and Span® 60 - R400 for sesame oil. We constructed two pseudo-ternary diagrams, one for each system, in order to define variables relevant to the composition (water and oil fraction, percentage of surfactant). We selected the best emulsions for further investigation. Stability of the emulsions was evaluated by the following physico-chemical tests: measurements of pH, electrical conductivity, particle size and rheological measurements. The method of one-step emulsification was efficient in producing stable multiple emulsions. A multiple emulsion from sunflower oil was developed with distinctive features: gel-lamellar phase multiple emulsion, a system not described yet. The characteristics of multiple emulsions described in this work, to know: use of vegetable oils, as sunflower and sesame oils; low concentrations of surfactants; multiplicity of droplets and lamellar gel phase at same system; they are desirable characteristics for the cosmetic industry, and they make these multiple emulsion potential delivery systems.
Conference papers on the topic "Estabilidade de emulsão"
Netto, Lívia Lacerda, Carine Cassimiro Cedrola, Gilmar Alves Mesquita-Junior, Fernanda Maria Pinto Vilela, and Fabiano Freire Costa. "PRODUÇÃO E ESTUDO FÍSICO-QUÍMICO DE EMULSÃO LÁCTEA ADICIONADA DE EXTRATO SECO DA FOLHA DE CAFEEIRO (Coffeaarabica L.)." In I Congresso Brasileiro de Biotecnologia On-line. Revista Multidisciplinar de Educação e Meio Ambiente, 2021. http://dx.doi.org/10.51189/rema/813.
Full textCampos, Fernanda Maria Teófilo, Bianca Oliveira Louchard, Vicente Sanford, Karina Maso, and Tamara Gonçalves. "Avaliação da estabilidade preliminar e atividade antioxidante de uma emulsão capilar condicionadora." In II Encontro do Programa de Pós-Graduação em Ciências Farmacêuticas da Universidade Federal do Ceará e I Simpósio Norte-Nordeste de Ciências Farmacêuticas. Fortaleza - CE, Brazil: Galoa, 2017. http://dx.doi.org/10.17648/ppgcf-2017-64905.
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